A channel extender is a device used with IBM's
line of computers to increase the maximum communication distances between the S/390
computers, or between an S/390 and
devices such as workstations, printers, and storage devices. As a rule, optical fiber channel connections transmit over
, which sends data over multiple paths within the fiber for distances less than two miles. Channel extenders transmit over
single mode fiber
, which sends data over a single path for distances of up to - and sometimes greater than - eighteen miles. Because the channel extender increases the distance of possible connections, a channel-connected network may be able to operate with fewer S/390 computers.
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